Fuse plug



NOV. 25, 1930. EKSTRAND 1,782,719

, FUSE PLUG Filed Sept. 16, 1929 Inventor jg], ZdwardfiZ/fafrarzi By a, ,m

14 r'iorney Patented Nov. 25, 1930 PATENT OFFICE EDWARD BERGER EKSTRAND, OF VEST SOMERVILLE, MASSACHUSETTS FUSE PLUG Application filed September 16, 1929. Serial No. 392,850.

This invention relates broadly to devices for making connections to electric circuits, and has as its primary object to simplify the construction of fuse plugs.

The invention consists broadly in the provision of a plug formed of bakelite or similar composition, provided with a socket extending inwardly from one end thereof, and a pair of spring contact members imbedded within said socket, one end of each of said spring contact members extending into the socket and being adapted for receiving and main taining a fuse within the socket, one of said contact members constituting a spring contact at the bottom end of the plug.

Another object of the invention is to pro vide a fuse plug which is simple in construction, compact, strong, durable, and wherein the fuse may be securely maintained and at the same time permitting of a ready removal or replacement of the fuse.

Other objects and advantages of the invention will become apparent during a study of the following description, taken in connection with the accompanying drawings, wherein Figure 1 is a vertical transverse sectional view taken through a. fuse plug constructed in accordance with the invention, the spring 0 contact members and fuse being shown in elevation.

Figure 2 is atop plan View of the assembled fuse plug.

Figure 3 is a detail elevational View of the 05 longer spring contact member.

With reference more in detail to the drawings, it will be seen that my improved fuse plug consists of a cylindrical body 5 formed of bakelite or any other suitable composition,

said plug being provided at one end with an outstanding peripheral flange 6. The body 5 is provided with a screw threaded sleeve 7, said sleeve being imbedded in the material as shown to advantage in Figure 1. The body 5 of the plug is also provided with a centrally disposed substantially circular socket or recess 8 extending inwardly from the top or flanged end of the body.

The socket 8 is of suitable diameter, and is provided with diametrically opposed vertical notches 99. A relatively short spring contact member 10 has the major portion thereof imbedded within the body 5, one end of the contact member 10 extending into the socket 8, said one end being bent backwardly upon itself to provide an arcuate spring-like linger 11 adapted to be disposed in one of the notches 9.

As shown to advantage in Figure 1, the 1 spring contact member 10 extends diagonally through the body 5. A relatively larger spring contact member 12 is of somewhat U- shaped formation, and has its bight portion 13 disposed outwardly of the body 5 in spaced 7 relation to that end of the body remote from the flange 6. The smaller leg 1 1 of the contact member 12 terminates in a laterally extended end portion and this end of the leg portion is imbedded within the body 5.

The larger leg 15 of the member 12 extends diagonally through the body 5 to terminate within the socket 8 in spaced parallelism with said one end of the member 10, and this end of the leg 15 terminates likewise in an arcuate-shaped spring finger 16, which finger is formed by bending the material of the leg 15 backwardly upon itself as shown to advantage in Figure 1. The finger 16 rests in the other of the notches 9.

A conventional fuse 17 is adapted to be positioned in the socket 8' and the fuse 17 has one end thereof received in a pocket 18 formed in that end of the spring contact member 10 arranged within the socket 8,

said pocket 18 being formed by pressing the $5 material of the spring outwardly as is apparent from a study of Figures 1 and 3.

The opposite end of the fuse 17 is adapted to be received in a like pocket 19 formed in V that end of the leg 15 which is disposed within the socket 8, whereby said fuse 17 will beheld securely within the socket in a horizontal position, since obviously the fingers 11 and 16 respectively will exert suflicient pressure to urge the parallel end portions of their respective contact members 10 and 12 inwardly toward one another, whereby the ends of the fuse 17 will be maintained within their respective seats 18 and 19. N

As is apparent, the bight portion 13 of the contact member 12 provides a spring contact for the bottom of the body 5 of the plug.

From the foregoing it will be seen that the construction is exceedingly compact, that the plug consists of but comparatively few parts, and that the socket 18 being of sufficient diameter, ones finger may be inserted therein in order tosecurea firm grip upon tfhe fuse 17 when removing or replacing the use.

Even though I have herein shown and described the preferred embodiment of my in vention, it is to be understood that the same 7 is susceptible to changes fully comprehended by the spirit of the invention as herein described, and the scope of the appended claims.

Having thus described my invention, w

I Wish to claim is:

a 1. A fuse plug havinga recessed cylindrical body, a metallic sleeve disposed about said body, said sleeve-being screw threaded,

a pair of spring contact members imbedded Within said body, said contact members having one end thereof extending into the recess', one of said contact members having an intermediate portion thereof extending exteriorly of the body at a point remote from the'recess, and the ends of said contact members Within said recess being provided With oppositely disposed pockets, and a fuse in said recess, the ends of said fuse being received in the pockets of said contact members.

2. A fuse plug'having a recessed body a a pair of contact members arranged in the body, said contact members respectively ha ing one end thereof arranged in the recess of said body, means normally urging the said one end of said members inwardly to- Ward one another, a fuse arranged in the recess of said body between said ends of said contact members, saidends of said co-ntact members provided with pockets for re ceiving the ends of said fuse.

In testimony whereof I affix my signature.

EDWARD BERGER EKSTRAND. 

